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US 4,332,131 AGranted
Apparatus and process of manufacturing a metal cord
AssigneeRhone-Poulenc-Textile
InventorsAlain Palsky, Guy Vella
Life of this patent
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AssigneeRhone-Poulenc-Textile
InventorsAlain Palsky, Guy Vella
Estimating the term…
A compact single-strand cord consisting of at least nine single wires of the same diameter twisted together in the same direction and with the same pitch, characterized in that, in cross-section, the cord has the shape of a compact stack of polygonal, preferably hexagonal, contour. The cord can be used for reinforcing rubber articles or elastomeric articles, in particular for reinforcing tires. The method of manufacture of the cord includes unwinding the wires from coils each consisting of a single wire. The wires are delivered by positive slip-drive rollers to a means for regrouping and a strand-laying means. The wires are assembled in a grid and die and twisted by an assembling twister. The wires are then guided through a double twist path loop, overtwisted, straightened and collected on a capstan. The machine for performing the process includes an unwinding means in the form of a plurality of feed bobbins, a positive slip-drive roller system, means for regrouping the advanced wires including a grid and a die, a revolving assembling twister and a spindle means including a loop and stationary cradle carrying an overtwisted, straightener and capstan for collecting the cord.
A single strand steel cord for reinforcing rubber articles such as tires, said cord comprising from nine to 52 single steel wires of the same diameter, twisted together in the same direction and with the same pitch, said twisted wires having a cross-sectional shape of a compact stack of polygonal contour, said cross-sectional shape being uniform along the entire length of the cord, said wires being disposed in at least one concentric layer of outer wires arranged around a central basic structure of 1, 2, 3 or 4 inner wires, all of the wires of said central basic structure and of each concentric layer, except the outer most concentric layer, tangentially contacting six adjacent wires, the wires in the outer most concentric layer, between the wires forming the corners of said polygonal contour, tangentially contacting four adjacent wires, and the wires forming said corners tangentially contacting three adjacent wires, whereby the mechanical properties of said cord, including breaking load, rigidity and fatigue, are uniform in the lengthwise direction.
A method of making a single-strand steel cord comprising a central basic structure of inner steel wires and at least one concentric layer of outer steel wires arranged around the central basic structure, said cord being formed from single non-twisted steel wires in a single stage, said method comprising the steps of:
Dependencies are inferred from the claim text.